As stated in a prior posting. Accuracy, control and follow up shooting.
Accuracy had better be dead nuts on.
Think you are going to be accurate under stress? You are more than likely going to be squeezing the hell out of that pistol grip when you have to shoot. Get a gun that fits you accordingly.
Make sure that if and when you have to shoot that the caliber you are shooting returns to Point of Aim quickly..
I/net caliber wars are for the birds.

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1. Treat every firearm as if it were loaded.
2. Never point a firearm at anything you do not intend to shoot.
3. Keep the finger off the trigger and firearm on safe until ready to shoot.
4. Know the target and what's beyond it.